Question

1. Motion of an object depends on its velocity only.

True

False

2. A car with a mass of 2500 kg is traveling at a speed of 30 m/s
due east. Choose the most appropriate answer to its momentum.

a. 30 m/s due east

b. 30 m/s

c. 75,000 kgm/s

d. 75,000 kgm/s due east

3. A car is traveling at 70 mph and then is involved in an accident
with a head-on collision into a very solid wall. As a passenger in
the car, which of the two scenarios will cause the greatest force
upon you? Assume both scenarios have the same elapsed time and the
car does not crumble during the collision.

a. An accident where the car comes to a stop at the wall.

b. An accident where the car bounces back off the wall.

4. A car with a mass of 2000 kg traveling at +20 m/s is hitting a
wall head-on and bounces back in the same direction it came from
with a speed of 20 m/s. The change in momentum is

a. -80,000 kgm/s

b. 0 kgm/s

c. +80,000 kgm/s

d. None of the above

5. A car with a mass of 2000 kg traveling at +20 m/s is hitting a
wall head-on and bounces back in the same direction it came from
with a speed of 20 m/s. If the impact time is 0.5 seconds, what is
the net impact force during the collision.

a. -160,000 N

b. 0 N

c. +160,000 N

d. None of the above

6. A block is being pushed along a friction-less surface with a net
force of +20 N. If the mass if the block is 40 kg, its acceleration
is

a. -2 m/s^2

b. +0.5 m/s^2

c. +800 m/s^2

d. None of the above

7. An object traveling with a constant velocity can have a non-zero
net force acting upon it.

True

False

8. Imagine you throw an object straight up in the air. At the very
peak of the object's path, the net force acting upon the object is
zero.

True

False

9. A person is pushing a crate with a mass of 20 kg across a floor
with a force of +120 N. The crate experiences a frictional force
with a magnitude of 40 N. What is the net acceleration of the
crate?

a. -8 m/s^2

b. -4 m/s^2

c. +4 m/s^2

d. +8 m/s^2

10. A person is pushing a crate with a mass of 20 kg across a floor
with a force of +120 N. The crate experiences a frictional force
with a magnitude of 40 N. At the same time, a second person is
pushing straight down onto the box with a force of 40 N. What is
the net horizontal acceleration of the crate?

a. +2 m/s^2

b. +4 m/s^2

c. +6 m/s^2

d. None of the above

Answer #1

Can someone answer the following three physics questions?
1. An object of mass m has acceleration a produced by a force F.
(a) How would the force be affected if the mass were doubled and
the acceleration was to remain the same? (b) How would the
acceleration be affected if the mass were doubled for the same
force?
2. A 20.0 kg crate has a force of 50.0 N acting on it is going
East. Neglecting friction, what is the...

In a box, four boxes act on an object and have the following
directions and magnitudes; A = 30.4 N East, B = 55.4 N North, C =
98.7 N West, and D = 77.1 N South East.
What is the magnitude of the net force (in N) on the
object?
What is direction of the force? (Clockwise from the positive y
axis).
A crate with a mass of 8.25 kg starts from rest at the top of a
29.7...

An object of mass 4 kg traveling at 10 m/s undergoes and
elastic head on collision with an object of mass 6 kg traveling at
6 m/s in the opposite direction. What are the final velocities of
the two masses?
An aircraft carrier steam catapult applies a force of
7.5×105 N over 75 m to launch a jet from
rest with a mass of 20,000 kg. What is the speed of the jet at
launch?
2 kg of ice at...

Car A of mass 1,274 kg is traveling east at 13.2 m/s when it
collides with car B of mass 1,596 kg which is traveling at 14.6 m/s
at 71.4 degrees N of W. The two cars stick together after the
collision. What is the magnitude of the final velocity of the
cars?

1)
A crash test dummy with a mass of 65-kg is in a moving car going at
20 m/s, until it crashes into a wall. If the applied force was
measured at 1,750 N, how long (in seconds) did the collision last?
2) Consider two hockey pucks on frictionless ice: Puck A with
a mass 1.10 kg, and Puck B with a mass of 0.60 kg.
Puck A is initially moving to the right at 1.75 m/s towards
puck B,...

The front 1.20 m of a 1,350-kg car is designed as a "crumple
zone" that collapses to absorb the shock of a collision.
(a) If a car traveling 22.0 m/s stops uniformly in 1.20 m, how
long does the collision last?
s
(b) What is the magnitude of the average force on the car?
N
(c) What is the magnitude of the acceleration of the car? Express
the acceleration as a multiple of the acceleration of
gravity.
g

The front 1.20 m of a 1,450-kg car is designed as a "crumple
zone" that collapses to absorb the shock of a collision. (a) If a
car traveling 26.0 m/s stops uniformly in 1.20 m, how long does the
collision last? s (b) What is the magnitude of the average force on
the car? N (c) What is the magnitude of the acceleration of the
car? Express the acceleration as a multiple of the acceleration of
gravity. g

a car (m1=2000kg) is traveling east with a velocity of 20i m/s.
this car collieds with a second car (m2=1500kg) that is traveling
north with a velocity 20j m/s. these 2 cars tangle together when
they collide.
what was the total kinetic energy before the collision?
what is the magnitude of the momentum of the 2 cars (as 1
system)?
what is the speed of the combined mass just after the
collision?
what is the direction traveled in degrees?

1) A car with a mass of 2000 kg with an initial
velocity of 10 m/s crashes into a wall. The time variation (Delta
t) is 0.015 seconds. What is the change in momentum? What is the
car's impulse and force? What if the car crashes into a haystack
with a time variation (Delta t) of 0.15 seconds. What would then be
its change in momentum, impulse and force. How about its final
velocity?
2) A swing made of a...

A
crash test dummy with a mass of 65 kg in a moving car going at 20
m/s until it crashes into a wall if the applied force was measured
at 1750 N how long in seconds did the collision last

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 1 minute ago

asked 11 minutes ago

asked 42 minutes ago

asked 52 minutes ago

asked 53 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago